@Redeemer: JCL once said (and its also written in the manual) that you shall not use the polygon flag for dynamic (moving) entities.
"should not" does not mean the same thing as "cannot". JCL makes several recommendations and suggestions for the layout of your code in the manual, but not all of them are good advice (in my opinion).
use kniematic physics entites.
Honestly, I'd really rather not have to resort to using a full blown physics engine when all I want to do is make a proper box trace across the level.
